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/* SPDX-License-Identifier: GPL-2.0 */
/*
* sha3-ce-glue.c - core SHA-3 transform using v8.2 Crypto Extensions
*
* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/sha3.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>
MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
int md_len);
static int sha3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha3_state *sctx = shash_desc_ctx(desc);
unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
if (!may_use_simd())
return crypto_sha3_update(desc, data, len);
if ((sctx->partial + len) >= sctx->rsiz) {
int blocks;
if (sctx->partial) {
int p = sctx->rsiz - sctx->partial;
memcpy(sctx->buf + sctx->partial, data, p);
kernel_neon_begin();
sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
kernel_neon_end();
data += p;
len -= p;
sctx->partial = 0;
}
blocks = len / sctx->rsiz;
len %= sctx->rsiz;
if (blocks) {
kernel_neon_begin();
sha3_ce_transform(sctx->st, data, blocks, digest_size);
kernel_neon_end();
data += blocks * sctx->rsiz;
}
}
if (len) {
memcpy(sctx->buf + sctx->partial, data, len);
sctx->partial += len;
}
return 0;
}
static int sha3_final(struct shash_desc *desc, u8 *out)
{
struct sha3_state *sctx = shash_desc_ctx(desc);
unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
__le64 *digest = (__le64 *)out;
int i;
if (!may_use_simd())
return crypto_sha3_final(desc, out);
sctx->buf[sctx->partial++] = 0x06;
memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial);
sctx->buf[sctx->rsiz - 1] |= 0x80;
kernel_neon_begin();
sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
kernel_neon_end();
for (i = 0; i < digest_size / 8; i++)
put_unaligned_le64(sctx->st[i], digest++);
if (digest_size & 4)
put_unaligned_le32(sctx->st[i], (__le32 *)digest);
*sctx = (struct sha3_state){};
return 0;
}
static struct shash_alg algs[] = { {
.digestsize = SHA3_224_DIGEST_SIZE,
.init = crypto_sha3_init,
.update = sha3_update,
.final = sha3_final,
.descsize = sizeof(struct sha3_state),
.base.cra_name = "sha3-224",
.base.cra_driver_name = "sha3-224-ce",
.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.base.cra_blocksize = SHA3_224_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
.base.cra_priority = 200,
}, {
.digestsize = SHA3_256_DIGEST_SIZE,
.init = crypto_sha3_init,
.update = sha3_update,
.final = sha3_final,
.descsize = sizeof(struct sha3_state),
.base.cra_name = "sha3-256",
.base.cra_driver_name = "sha3-256-ce",
.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.base.cra_blocksize = SHA3_256_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
.base.cra_priority = 200,
}, {
.digestsize = SHA3_384_DIGEST_SIZE,
.init = crypto_sha3_init,
.update = sha3_update,
.final = sha3_final,
.descsize = sizeof(struct sha3_state),
.base.cra_name = "sha3-384",
.base.cra_driver_name = "sha3-384-ce",
.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.base.cra_blocksize = SHA3_384_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
.base.cra_priority = 200,
}, {
.digestsize = SHA3_512_DIGEST_SIZE,
.init = crypto_sha3_init,
.update = sha3_update,
.final = sha3_final,
.descsize = sizeof(struct sha3_state),
.base.cra_name = "sha3-512",
.base.cra_driver_name = "sha3-512-ce",
.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
.base.cra_blocksize = SHA3_512_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
.base.cra_priority = 200,
} };
static int __init sha3_neon_mod_init(void)
{
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
static void __exit sha3_neon_mod_fini(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_cpu_feature_match(SHA3, sha3_neon_mod_init);
module_exit(sha3_neon_mod_fini);
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